In a furious exchange of tweets and counter-tweets, President Donald Trump said Tuesday that Republican Sen. Bob Corker “couldn’t get elected dog catcher,” and the senator fired back that Trump was “utterly untruthful.”

“#AlertTheDaycareStaff,” tweeted Corker, an outspoken GOP critic of Trump.The latest contretemps came ahead of Trump’s lunch with Republican senators on Capitol Hill, as Congress turns its focus to overhauling the nation’s tax code.

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Corker, (R-Tenn.,) said on NBC’s “Today” Tuesday that the Republican-led Congress should set the course on taxes after Trump shot down at least one GOP idea on retirement plans on Monday.

Asked if Trump should leave well enough alone, Corker said, “I think that’s the best way for us to have success.”

That prompted an angry Twitter response from the president, who said, “Bob Corker, who helped President O give us the bad Iran Deal & couldn’t get elected dog catcher in Tennessee, is now fighting Tax Cuts....”

Corker took to his own Twitter account to respond: “Same untruths from an utterly untruthful president. #AlertTheDaycareStaff.” Trump then called Corker “lightweight.”

Corker, the Senate Foreign Relations chairman, has previously dubbed the White House an “adult day care center” and charged that Trump could be setting the nation on a path to World War III. Trump has called Corker “Liddle’ Bob Corker.”

Speaking with reporters from Capitol Hill, Corker continued trading barbs with the president, saying he believes Trump is "almost devolving" in office.

Asked if he should have backed Trump's presidential campaign, said he "would not do that again." He also said Trump has "great difficulty with the truth" and that "debasing" the US would be his prime legacy as President.

"You wouldn't support him again?" a CNN reporter asked.

"No, no way," Corker said.

Corker said Trump has "proven himself unable to rise to the occasion."

Nonetheless, Republicans and the Trump administration are determined to get tax legislation into law this year, and all sides seem to think they can unite around that goal.

Sen. John McCain, R-Ariz., implicitly criticized Trump on Monday, though not by name, for getting a draft deferment during Vietnam for bone spurs in his foot. And Trump spent much of August lashing out at Majority Leader Mitch McConnell, R-Ky., and blaming him for the Senate’s failure to pass legislation to repeal and replace “Obamacare.”

No. 3 Senate Republican John Thune of South Dakota said he hopes to hear Trump “drive home the message that he wants to be a partner, a constructive partner that helps us get accomplishments that help everybody.”

“If you have people who are running for re-election next year, whether it’s a House member or one of the senators who’s up this year, I think the best thing you can go back and talk about is that you got results,” Thune added. “And I think that to the degree the president delivers that message it will be very well received by Republican senators.”

Suddenly, a protester emerged from the press scrum, loudly screaming “Trump is treason!” and throwing a handful of Russian flags with Trump’s name on them in the direction of the president. Trump and McConnell kept walking as security officials removed the protester, who identified himself to reporters as Ryan Clayton of Americans Take Action.

Speaking with reporters after the lunch, McConnell said the issues between Trump and Corker were not brought up during the meeting, adding that the topic of tax reform took center stage.

"We’re all on the same page on the issues," McConnell said.

The tax plan crafted by Trump and Republican leaders calls for steep tax cuts for corporations and potentially for individuals. It would double the standard deduction used by most Americans, shrink the number of tax brackets from seven to three or four, and repeal inheritance taxes on multimillion-dollar estates. But crucial details of the plan have yet to be worked out, notably what income levels would fit with each tax bracket.